Highly Linear-Gain Oscillator
a high-linear, oscillator technology, applied in the field of oscillators, can solve the problems of nonlinearity of the gain of the oscillator in many actual designs, drop in modulation accuracy, and corrupted spectrum of the transmit signal, so as to maximise the linearity of the gain of the oscillator, the effect of minimising the variation of gain
Inactive Publication Date: 2013-06-06
QUALCOMM TECH INT
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Benefits of technology
The patent text describes a way to make an oscillator that can output signals at different frequencies. The invention tries to minimize the change in how well the oscillator works over its entire range of frequencies. This means that the invention aims to make the oscillator more accurate and reliable across its entire range of frequencies.
Problems solved by technology
Nonlinearity in Kv can cause a drop in the modulation accuracy as well as corrupting the spectrum of the transmit signal.
However, oscillator gain in many actual designs suffer from nonlinearity because of dependence of the gain on the frequency.
These prior systems and methods can be circuit intensive, costly, and have power and area penalty.
Method used
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[0027]In general, an oscillator can be implemented around an oscillating circuit such as an LC resonator. The frequency of the oscillator can be a function of L and C. For example, in a LC based VCO the frequency of oscillation can be changed by changing the capacitance of the capacitor across the tank. This can lead to a non-linear dependence of the VCO gain on the frequency as explained below.
[0028]For the sake of illustration, a DCO is used when describing the prior art and embodiments of the present invention. However, the same principles describing the prior art and the embodiments of the present invention also apply to analogue VCOs and other similar oscillators.
[0029]The general structure of a prior art oscillator LC tank 10 is shown in the FIG. 1, which comprises an inductance source 11 and a variable capacitor 12 coupled across the inductance source 11. This LC tank 10 along with an active circuit builds a conventional VCO core 13 as shown in FIG. 2. The active circuit comp...
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A variable frequency oscillator includes an inductance unit having a first inductance, a first variable capacitor coupled across the inductance unit, and a second variable capacitor coupled across a part of the inductance unit. The inductance of the part of the inductance unit coupled by the second variable capacitor is a proportion of the first inductance.
Description
BACKGROUND OF THE INVENTION[0001]This invention relates to oscillators, in particular oscillators whose operating frequency can be varied in response to an input.[0002]There is a need for low-cost and highly efficient transmitters for a wide class of radio communication and measurement devices. Phased-Locked-Loops (PLLs) are integral to radio frequency (“RF”) systems for generating an output signal having a predetermined frequency and / or phase relationship with a reference signal. The PLL comprises an oscillator device for generating a desired frequency signal. Such an oscillator device may be a digitally controlled oscillator (DCO) or a voltage controlled oscillator (VCO). In systems that use PLLs for the direct modulation of a transmit signal, e.g. continuous-wave (CW) FM in radar or polar modulations, the linearity of the oscillator gain Kv becomes very important. Nonlinearity in Kv can cause a drop in the modulation accuracy as well as corrupting the spectrum of the transmit sig...
Claims
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IPC IPC(8): H03B5/12
CPCH03L7/099H03B5/1228H03B5/1215H03B5/1243H03B2200/0092H04L2027/0071H03B5/1278H04L27/0014H04L2027/0016H04L2027/0055H03J2200/10H03B5/1212H03J3/06H04L27/361
Inventor ANDRABI, SHUJA HUSSAINZARE-HOSEINI, HASHEM
Owner QUALCOMM TECH INT